It's a pretty common request, actually. People want to sit where they can see a particular screen better (at places with screens) all the time. Or maybe they want to sit further away from the noisy bar. Not too close to the entrance on a cold day, not too close to the kitchen door where it's busy, not too close to a table with children... So no, I don't think it's going to raise an eyebrow unless you make your request in an awkward way. If you can't think of anything else, just say that you would rather not sit at that particular table because you once got your heart broken there.